High-speed cutter block for woodworking and like machines



March 12,1929 HOLLIS 1,705,251

HIGH SPEED CUTTER BLOCK FOR WOODWORKING AND LIKE MACHINES Filed Nov 2. 1926 2 Sheets-Sheet 1 Inve r. Kobzrw PcTTOR NEYS.

March 1929- R. HOLLIS 05, 1

HIGH SPEED CUTTER BLOCK FOR WOODWORKING AND LIKE MACHINES Filed Nov. 2Q 1926 2 Sheets-Sheet 2 PTTORNEYS Patented Mar. 12, 1929.

UNITED STATES PATENT OFFICE... A

ROBERT HOLLIS, 9e WANSQIEAR ENGLAND, ess os To HOLLIS.

BLOCK we OF ND N ENGLAND- mea-sresn CUTTER BLOCK IQR WQODWQRKING AND LIKE MACHINE Application filed November a, was, Serial No. 145,754, and in Great Britain May 2s, 1.926.

' ing the finish of the Work procluced.

Another obj ect of this inventionjis the making of such cutter blocksmore easily ad aptable to the production of various forms oi? moulding, and still further object of this invention is to provide a means tor-accurately setting the cutting tools "in proper relation in the cutter block.

In carrying this invention into effect I construct a series of discs adapted to fit closely one against another and I form holes iii their centre and thread them upon a sleeve having at each end an adjustable lock nut, so that by tightening up such nuts the series of discs may be clamped rigidly together to {term one complete cutter block.

With suclran arrangement of discs I am enabled to use a considerable number of cutting tools andvhave found six- ;to eight tools in one disc to Work efficiently, all the tools in one disc being adaptedto dea-lwvith one element of the moulding pattern to he produced.

Such discs with mul-tiplecut-ting edges produce a number of cuttingimpacts on the Work per revolution in proportion 'to'the number of cutting tools 'carriedby each disc so that by this multiplicityo f cutting inipacts, I secure an increased finenessoffinish to the Work, and a greatlyincreased rate of output.

In most cases I in suchrelationship that thecutti-ng tools of one disc are slightly behindsthoseof the inert earlier disc of the series and --sli htly in front of those of the next later discor" the series, and when convenient I make the too-lsof such a idth that the cutting area swept by ,one

means to obtain a; perfect :finish. atthepoints set my discs on the sleeve Where one element of the pattern joins another. I

I make each disc of my improved cutter rues s esn new block separate and independent from-the other and complete in itseliso that I may build up any desired cutter block comprislng any number of discs with their cutters, the discsbeing placed in any desired order of sequence one to another.

It will be understood that the efliciency of tool carrying discs or this character de pends on the accuracy With which all the cutting edges on each disc can beset relatively.

to the centre of rotation and this essential requirement I achieve by forming. annular grooves in the sides oi the discs and concentric with the discs and constructing gauge arms having projections adapted to take into the said annular groones by means vof 'vyhich the gauge arms maymoveround the disc so that their gauge faces may sweep across the cutting edges of the tools set in the discs and I thus secure an accurate means .035 setting the cutting tools correct relation to ,the

centre ot rotation .of the discs. 1

My invention maybe more cleanly under- ,j of a ,gauge ting edges of my compound cutter block superimposed one upon another.

- FigI-S is a. front view .of cutter ibloelr.

shows adeubl sauc a in P tion on a cylinder cutter block. v i p p 1g ,noW to Figs. 1, 3 andB, Iconstruct discssuchas illustrated and hava oiuis th ir pe phe es fla rr c ent to theci-rcle'at those pointsfl'aiid provided with holes 5. Z); or. ethelyconuenient meansavhich may secure thecutters G. in their placeson-the discs. I formany convenient number of-fiatsurfaces on' ;n1y discs ,to take a corresponding number of cutters and I make all the cutters 1.011 101 di qpz iden c stood hyreiciience to :the accompanying sheet .ofdrawings 5111 arhich z i a curved pro ection 1". struck from the same.

.centre as the annular groove in the discs and adapted to take into these grooves and to move freely therein around the centre of rotation R. of the disc in such a manner that each point on the gauge arm maintains an unvarying relation to the said centre of rotation.

I fix upon the outer end of this gauge arm a gauge plate 19. against the edges 2). of which each cutting edge in turn may be, accurately set in relation to the centre of rotation. If desired the face of the gauge plate may he graduated as shown and the tools may be set to these graduation lines.

i I attach the gauge arm to the disc by a screw pin 8. which takes into screwed holes s. s. set at convenient points on the face of the disc such that the gauge arm when thus fixed is in position to gauge one or other of the cutting tools. It will be obvious that I may use many different methods of clamping the gauge arm in the desired position for use but the screw pin as above described is the method I have found most convenient and reliable.

I construct tool arms adapted to'lit on to either side of my disc and when using a long cutter block, especially such as are known in the art as cylinder cutter blocks, I set a gauge arm on each end as shown in Fig. 9, and in such case I use a long gauge plate, as shown, which may be fixed upon both gauge arms and thus extend right across the cutter block.

I make my disc of any convenient thickness and I separate the periphery of one disc from that of another when necessary by thin washers or by a set off we.

I form a hole in the centre of my disc and a keyway or keyways 7t. and I thread any desired number of such discs onto a sleeve 7 S. as shown in Figs. 1 and 8, which sleeve carries a feather over which the keyways of the disc may slide. I form a collar S. on one end of the sleeve S. and a screw thread with nut n. on the opposite end and by this means I fix the discs rigidly on the sleeve.

I form a screw thread on the inner surface of my sleeve which engages with'a threaded spindle P. and I adjust the position. of the sleeve on the spindle by lock nuts P. By these means I construct a compound cutter block as shown in 1 and 8, having any convenient number of discs D. D. D. and so forth, each disc carrying a series of cutters C. C. C. and so'forth, each series of cutters being adapted to deal with one element of the moulding or pattern to be formed.

I arrange my discs in relation one to an-.

other in such a manner that the cutters dealing with one element of the pattern do not in general form an impact with the work at the same instant as the cutters dealing with another element of the pattern.

This method maybe understoodby referring to Figs. 1 and 8, and the diagrammatic Fig. 7. Thus in Fig. 8, the series of cutters C. is represented in the drawing as lying immediately behind the series C. while the series C. is intermediate behind these two series. It will be seen therefore that the series C. and 0'. make impact with the work at the same moment while the series C. make impact with the work at a different moment;

Fig. 7, shows the necessity and advantage of this arrangement. Here F. represents a moulding to he produced and C. C. G5. represents the edges of a series of cutters shown diagrammatically as superimposed one upon another. Each of these series of cutters deals withone element of the moulding to be produced. Thus the cutters C. deal with the element f. of the moulding F.; G. with f. and C with f.

It will now be seen that by arranging my cutters so that the series C. make impact with the work at a moment different from C.

and G. I am enabled to make each series of cutters overlap the area swept by the adjoining series of cutters. Thus 6'' overlaps f while C. overlaps f. and f and soon. By this system of overlapping of the cutters I am enabled to take a clean sweep of the work and avoid the inaccuracies which are involved'when the path of one cutter ends at the point where the path of the next begins.

I adjust the relationship of one series of cutters to another by means of the position of the keywayh. in the disc and I may form more than one keyway in each disc so that either one maybe used as may be desi able for adjusting the relation of one disc to the next in order.

I do not limit this invention to any given number of discs or series ofcutters nor to any particular form of design but I have found that with this invention herein described I am able to produce the finest work at a speed quite unknown heretofore and without any increase of revolutions per minute of the cutter block spindle beyond that in common practice. f

that I claim is 1. A device of the character described, com- With the perforations of the disc, the organization being such that when the set screw is in engagement with either of said perforations the setter is in parallel relation to one of said cutters. r

2. A device or" the character describechcomprising in combination a disc adapted to support a plurality of tools disposed tangentially of the disc, said disc being provided in one face thereof with an annular concentric depression, a tool setter provided at one side thereof with an arc-shaped projection adapted to fit said recess; and means for securing the setter. to the, disc at predetermined points in said depression.

In testimony whereof I have signed my name to this specification.

- ROBERT HOLLIS. 

